High-strength gray cast iron, casting and preparation method of high-strength gray cast iron

A technology of high-strength, gray cast iron is applied to castings and the preparation of the high-strength gray cast iron. The effect of simple method, excellent tensile strength and hardness, and easy availability of raw materials

Active Publication Date: 2015-04-29
WUHU GUODING MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Pump casings, containers, towers, flanges, stuffing box bodies and glands, carbonization towers, machine tool beds, columns, cylinders, gears and nitrification towers are all gray cast iron. Due to the tensile strength of the existing gray castings Not high often leads to high scrap rate of castings during processing and molding, which greatly increases production costs

Method used

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preparation example Construction

[0014] The present invention also provides a preparation method of high-strength gray cast iron, the preparation method comprising:

[0015] 1) The process of preheating pig iron, scrap steel, furnace charge, antimony oxide, silicon carbide, nickel oxide, thorium oxide and recarburizer at 1200-1300°C;

[0016] 2) The process of melting the preheated raw materials at 1460-1470°C to obtain molten iron;

[0017] 3) adding ferrosilicon, silicon-calcium inoculants, and silicon-strontium inoculants into the molten iron and stirring to obtain inoculated molten iron;

[0018] 4) A process of adding high-carbon ferromanganese into the inoculated molten iron at 1490-1510° C. and stirring to obtain high-strength gray cast iron.

[0019] In the present invention, the amount of each raw material is selected within a wide range. In order to make the high-strength gray cast iron have more excellent mechanical properties, preferably, relative to 100 parts by weight of pig iron, the amount of...

Embodiment 1

[0032] Firstly, 100kg of pig iron, 140kg of steel scrap, 140kg of recycled material, 20kg of nickel oxide, 0.8kg of thorium oxide, 0.25kg of antimony oxide, 0.15kg of silicon carbide and 1.3kg of coke were preheated at 1250°C for 30min at 1250°C. The final raw materials were melted at 1465°C to produce molten iron; then 0.4kg of ferrosilicon, 0.9kg of silicon-calcium inoculant, and 0.7kg of silicon-strontium inoculant were added to the molten iron and stirred to obtain Inoculating molten iron: Finally, 2.5 kg of high-carbon ferromanganese with a grade of 65 was added to the inoculating molten iron at 1500° C. and stirred to obtain high-strength gray cast iron.

[0033] Wherein, the steel scrap contains 0.3% by weight of carbon, 0.3% by weight of manganese, 0.01% by weight of phosphorus, the balance of iron and unavoidable trace elements; Carbon, 2.5% by weight of silicon, 0.07% by weight of manganese, 0.02% by weight of sulfur, 0.02% by weight of phosphorus, the balance of iro...

Embodiment 2

[0036] Firstly, 100kg of pig iron with brand Z18, 135kg of steel scrap, 130kg of furnace charge, 15kg of nickel oxide, 0.4kg of thorium oxide, 0.2kg of antimony oxide, 0.1kg of silicon carbide and 1kg of coke were preheated at 1250°C for 30 minutes; The raw materials were melted at 1460°C to obtain molten iron; then 0.2kg of FeSi90Al1.5 ferrosilicon, 0.5kg of silicon-calcium inoculant, and 0.5kg of silicon-strontium inoculant were added to the molten iron and stirred to obtain inoculated Molten iron: Finally, 2 kg of high-carbon ferromanganese with a grade of 65 was added to the inoculated molten iron at 1490° C. and stirred to obtain high-strength gray cast iron.

[0037] Wherein, the steel scrap contains 0.3% by weight of carbon, 0.3% by weight of manganese, 0.01% by weight of phosphorus, the balance of iron and unavoidable trace elements; Carbon, 2.5% by weight of silicon, 0.07% by weight of manganese, 0.02% by weight of sulfur, 0.02% by weight of phosphorus, the balance of...

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Abstract

The invention discloses high-strength gray cast iron, a casting and a preparation method of the high-strength gray cast iron. The preparation method comprises steps as follows: 1), pig iron, scrap steel, foundry returns, antimony oxide, silicon carbide, nickel oxide, thorium oxide and a carburant are preheated at the temperature of 1,200-1,300 DEG C; 2), the preheated raw materials are molten at the temperature of 1,460-1,470 DEG C to prepare molten iron; 3), silicon iron, a silicon-calcium inoculant and a silicon-strontium inoculant are added to the molten iron and are stirred to prepare inoculated molten iron; 4), high carbon ferromanganese at the temperature of 1,490-1,510 DEG C is added to the inoculated molten iron and stirred to prepare the high-strength gray cast ion. The casting prepared from the high-strength gray cast iron has excellent mechanical performance.

Description

technical field [0001] The invention relates to the field of high-strength gray cast iron, in particular to a high-strength gray cast iron, a casting and a preparation method of the high-strength gray cast iron. Background technique [0002] Pump casings, containers, towers, flanges, stuffing box bodies and glands, carbonization towers, machine tool beds, columns, cylinders, gears and nitrification towers are all gray cast iron. Due to the tensile strength of the existing gray castings Not high often leads to a high scrap rate when the casting is processed and formed, which greatly increases the production cost. Contents of the invention [0003] The object of the present invention is to provide a high-strength gray cast iron and its preparation method, and the castings prepared from the high-strength gray cast iron have excellent mechanical properties. [0004] In order to achieve the above object, the present invention provides a preparation method of high-strength gray...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C21C1/08
Inventor 俞家华
Owner WUHU GUODING MACHINERY MFG
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